US10331243B2 - Position indicating module and stylus pen - Google Patents

Position indicating module and stylus pen Download PDF

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Publication number
US10331243B2
US10331243B2 US15/188,770 US201615188770A US10331243B2 US 10331243 B2 US10331243 B2 US 10331243B2 US 201615188770 A US201615188770 A US 201615188770A US 10331243 B2 US10331243 B2 US 10331243B2
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electrode
core body
terminal
dielectric
pen
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US15/188,770
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US20160313812A1 (en
Inventor
Yuji Katsurahira
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Wacom Co Ltd
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Wacom Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0383—Signal control means within the pointing device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus

Definitions

  • the present disclosure relates to a position indicating module and a stylus pen that are used to input an indicated position on a tablet.
  • a position indicator having a coil or an electrode provided in a position indicating portion to obtain a coordinate position on a tablet in Patent Document 1 (Japanese Patent Laid-Open No. 2007-164356).
  • a position indicator capable of detecting a pen pressure with high accuracy and providing very good operability is realized which includes a variable capacitance capacitor that changes in capacitance according to the pen pressure, and which converts the pen pressure into a digital value and transmits the digital value.
  • Patent Document 2 Japanese Patent Laid-Open No. 1993-275283
  • Patent Document 3 Japanese Patent Laid-Open No. 2011-186803
  • variable capacitance capacitors using a dielectric as the variable capacitance capacitor that changes in capacitance according to the pen pressure.
  • Patent Document 1 Japanese Patent Laid-Open No. 1994-250772
  • Patent Document 5 Japanese Patent Laid-Open No. 1995-295722
  • electrostatic stylus pens disclose electrostatic stylus pens.
  • a variable capacitance capacitor as described in Patent Document 2 or Patent Document 3 has a pen core slightly displaced according to a pen pressure.
  • a connecting part affects pen pressure detection, thus presenting problems such as a degradation in pen pressure detection characteristics, inability to perform input by light touch, and the like.
  • problems such as a degradation in pen pressure detection characteristics, inability to perform input by light touch, and the like.
  • problems there is for example a problem of being unable to replace the pen core easily even when a pen tip is worn away.
  • the present disclosure facilitates addressing the above-described problems, and proposes an electrostatic stylus pen capable of detecting a change in a pen pressure applied by a light touch with high accuracy, and a position indicating module used in the electrostatic stylus pen.
  • the present disclosure proposes an electrostatic stylus pen from which a pen core including an electrode is detachable.
  • a position indicating module includes: a dielectric having two surfaces opposed to each other; a first electrode disposed on a first surface of the dielectric; a second electrode disposed so as to face a second surface of the dielectric, an area of contact of the second electrode with the second surface being changed by an external force; a core body portion having a third electrode in a tip portion, and transmitting the external force to the second electrode; a first terminal electrically connected to the first electrode; a second terminal electrically connected to the second electrode; and a third terminal electrically connected to the third electrode.
  • a conductive portion electrically connected to the third electrode is provided to another end (opposite end from the tip portion) of the core body portion, a core holder formed of a conductive material is provided, and the third electrode and the third terminal are connected to each other by detachably press-fitting the other end of the core body portion into the core holder.
  • an electric connection between the core holder and the third terminal is made via a conductive spring.
  • the second electrode is formed of an elastic member having conductivity, and the second electrode and the core holder are laminated to both surfaces of a flexible circuit board having flexibility.
  • a conductive portion electrically connected to the third electrode is provided to another end (opposite end from the tip portion) of the core body portion, and the conductive portion and the third terminal are connected to each other by a flexible electric wire electrically connected to the conductive portion and extending in a direction perpendicular to an axis of the core body portion.
  • an electrostatic stylus pen facilitates replacement of a pen core and can detect a change in a pen pressure applied by a light touch with high accuracy.
  • FIG. 1 is a structural diagram of an example of a position indicating module according to a first embodiment.
  • FIG. 2 is a diagram showing a dielectric, a spacer, and a second electrode in the example of FIG. 1 each being disassembled and arranged.
  • FIG. 3 is a diagram showing external appearances of a first terminal and a second terminal in the example of FIG. 1 .
  • FIG. 4 is an external view of a coil spring in the example of FIG. 1 .
  • FIG. 5 is a structural diagram of an example of a position indicating module according to a second embodiment.
  • FIG. 6 is a developed view of a polyimide film in the example of FIG. 5 .
  • FIG. 7 is a structural diagram of an example of a position indicating module according to a third embodiment.
  • FIG. 8 is a developed view of a polyimide film in the example of FIG. 7 .
  • FIG. 9 is a structural diagram of an example of a position indicating module according to a fourth embodiment.
  • FIG. 10 is a developed view of a polyimide film in the example of FIG. 9 .
  • FIG. 11 is a structural diagram of an example of a position indicating module according to a fifth embodiment.
  • FIG. 12 is a diagram showing the shape of a core body holder in the example of FIG. 11 .
  • FIG. 13 is a developed view of a polyimide film in the example of FIG. 11 .
  • FIG. 14 is an external view of a coil spring in the example of FIG. 11 .
  • FIG. 15 is a structural diagram of an example of a first modification of the fifth embodiment.
  • FIG. 16 is a diagram showing the shape of a core body holder in the example of FIG. 15 .
  • FIG. 17 is a diagram showing a constitution of an example of a pen core used in a second modification of the fifth embodiment.
  • FIG. 18 is a developed view of a polyimide film used in the second modification of the fifth embodiment.
  • FIG. 19 is a structural diagram of an example of a portion of a position indicator including a position indicating module according to a sixth embodiment.
  • FIG. 20 is a diagram showing an outline of a position indicating module according to a seventh embodiment.
  • FIG. 21 is an exploded view showing an internal structure in FIG. 20 .
  • FIG. 22 is a developed view of a polyimide film in the example of FIG. 20 .
  • FIG. 23 is a diagram showing an example of a configuration in a case where the position indicating module in the example of FIG. 20 is attached to a printed board.
  • FIG. 24 is a diagram showing an embodiment of a stylus pen.
  • FIG. 25 is a diagram showing an example of a circuit configuration of the embodiment of the stylus pen.
  • FIG. 26 is a diagram showing operation of the embodiment of the stylus pen.
  • FIG. 27 is a diagram showing an example of a configuration of a tablet used to detect the stylus pen.
  • FIG. 28 is a diagram showing an X-axis whole surface scanning operation.
  • FIG. 29 is a diagram showing an operation for transition to partial scanning.
  • FIG. 30 is a diagram showing a partial scanning operation.
  • FIG. 1 is a structural diagram (central sectional view) of an example of a position indicating module according to a first embodiment.
  • reference numeral 11 denotes a dielectric substantially in the shape of a disk
  • reference numeral 12 denotes a first electrode disposed on a first surface of the dielectric 11
  • reference numeral 13 denotes a second electrode formed of a flexible material.
  • the second electrode 13 is disposed on the side of a second surface of the dielectric 11 which second surface is opposed to the first surface of the dielectric 11 with a ring-shaped spacer 14 interposed between the second electrode 13 and the second surface.
  • a conductive rubber for example, can be used as the second electrode 13 , or a material obtained by depositing a conductive substance on one surface of a polyimide film may be used as the second electrode 13 .
  • FIG. 2 is a perspective view when the dielectric 11 , the spacer 14 , and the second electrode 13 are each disassembled and arranged. At least the side of a surface 13 a of the second electrode 13 which surface is in contact with the spacer 14 has conductivity. The conductive surface is provided with a projecting portion 13 b.
  • reference numeral 15 denotes a first terminal, which may comprise a metal.
  • the first terminal 15 is electrically connected to the first electrode 12 on the dielectric 11 .
  • Reference numeral 16 denotes a second terminal, which may comprise a metal.
  • the second terminal 16 is electrically connected to the second electrode 13 .
  • FIG. 3 shows external appearances of the first terminal 15 and the second terminal 16 .
  • the first terminal 15 is provided with a flat part 15 a connected to the first electrode 12 .
  • the second terminal 16 is provided with a flat part 16 a connected to the projecting portion 13 b of the second electrode 13 .
  • reference numeral 17 denotes a pen core substantially in the shape of a rod, the pen core in the present example being formed of a nonconductor material, for example a resin. In the present example, only the pen core 17 constitutes a core body portion.
  • a third electrode 18 is embedded in a tip 17 a of the pen core 17 .
  • a connecting end 17 b of the pen core 17 which connecting end is on the opposite side from the tip 17 a , is coated with a conductive substance. The connecting end 17 b is electrically connected to the third electrode 18 via a conductor 17 c provided within the pen core 17 .
  • Reference numeral 19 denotes a spring formed of a conductive material.
  • the spring in the present example is a coil spring.
  • FIG. 4 shows an external appearance of the coil spring.
  • An elastic winding portion 19 a and a third terminal 19 b extending straight are provided.
  • Reference numeral 20 denotes a core body holder formed of a conductive material.
  • the core body holder 20 has such a size and shape as to fit into the winding portion 19 a of the coil spring 19 .
  • the coil spring 19 is in contact with and electrically connected to the core body holder 20 by a projecting portion 20 a projecting in the shape of a flange from an outer circumferential surface of the core body holder 20 .
  • the core body holder 20 is provided with a hole into which to insert and fit the connecting end 17 b of the pen core 17 .
  • the connecting end 17 b of the pen core 17 is press-fitted into the core body holder 20 , whereby the core body holder 20 is electrically connected to the connecting end 17 b.
  • Reference numeral 21 denotes a pressing body, which may comprise a plastic.
  • One end of the pressing body 21 has a rounded cylindrical shape, and another end of the pressing body 21 has a flat shape.
  • the flat-shaped other end side of the pressing body 21 is bonded to the core body holder 20 .
  • the rounded one end side of the pressing body 21 is disposed so as to be in contact with the second electrode 13 .
  • An elastic material such as a rubber may be used as the pressing body 21 .
  • Reference numeral 22 denotes a housing, in which the above-described members of the dielectric 11 , the first electrode 12 , the second electrode 13 , the spacer 14 , the first terminal 15 , the second terminal 16 , the pen core 17 including the third electrode 18 , the coil spring 19 , the core body holder 20 , and the pressing body 21 are assembled to form a position indicating module.
  • the housing 22 is disassembled into a plurality of parts not shown in the figures, and is assembled by a method such as press-fitting, bonding, or the like.
  • the dielectric 11 , the first electrode 12 , the second electrode 13 , and the spacer 14 constitute a variable capacitance capacitor.
  • the variable capacitance capacitor is an example of a configuration of a pen pressure detecting unit.
  • the dielectric 11 and the second electrode 13 are not in contact with each other due to the spacer 14 .
  • the pressing body 21 displaces the second electrode 13 , so that the second electrode 13 comes into contact with the second surface of the dielectric 11 .
  • the area of the contact changes according to the magnitude of the pen pressure applied to the pen core 17 .
  • a capacitance between the first terminal 15 and the second terminal 16 changes according to the magnitude of the pen pressure applied to the pen core 17 .
  • the third electrode 18 provided in the pen core 17 is electrically connected to the third terminal 19 b via the core body holder 20 and the coil spring 19 irrespective of the presence or absence of a pen pressure.
  • the coil spring 19 is used both as a part acting to return the pen core 17 when a pen pressure disappears and as a connecting portion connecting the third terminal and the third electrode 18 to each other.
  • the connecting portion connecting the third terminal and the third electrode 18 to each other does not affect pen pressure detection, and a light load can be detected with high accuracy.
  • FIG. 5 is a structural diagram (central sectional view) of an example of a position indicating module according to a second embodiment.
  • the same configurations as those of the position indicating module according to the first embodiment shown in FIG. 1 are identified by the same reference symbols.
  • the second embodiment has many commonalities with the first embodiment. The following description will therefore be made only of parts different from those of FIG. 1 .
  • Reference numeral 23 denotes a coil spring formed of a conductive material.
  • the coil spring 23 is substantially the same as the coil spring 19 shown in FIG. 4 , the coil spring 19 being used in the first embodiment. However, the coil spring 23 does not have a part corresponding to the terminal 19 b , which is a part extending straight. As with the coil spring 19 in the first embodiment, the coil spring 23 is inserted into a core body holder 20 , and brought into contact with a projecting portion 20 a . The coil spring 23 is thus electrically connected to the core body holder 20 .
  • Reference numeral 24 denotes a flexible substrate, as illustrated a polyimide film.
  • FIG. 6 is a developed view of the polyimide film.
  • the polyimide film 24 has a shape formed by coupling a ring-shaped part and a linear part to each other.
  • a ring-shaped conductive pattern 24 a is formed on the ring-shaped part by etching or the like, and a linear conductive pattern 24 b is formed on the linear part by etching or the like, such that the conductive pattern 24 a and the conductive pattern 24 b are continuous with each other.
  • the polyimide film 24 is bent at a right angle along a-a′ in FIG. 6 .
  • the conductive pattern 24 a on the ring-shaped part of the polyimide film 24 has a same size as an end surface of the coil spring 23 , and is electrically connected to the coil spring 23 .
  • the conductive pattern 24 b on the linear part projects as a third terminal 24 b.
  • Reference numeral 25 denotes a housing, in which all members are assembled to form a position indicating module as in the first embodiment.
  • the housing 25 is disassembled into a plurality of parts not shown in the figures, and is assembled by a method such as press-fitting, bonding, or the like.
  • a third electrode 18 is electrically connected to the third terminal 24 b via the core body holder 20 , the coil spring 23 , and the polyimide film 24 .
  • the coil spring 23 is used both as a part acting to return the pen core 17 when a pen pressure disappears and as a connecting portion for connection from the third terminal 24 b to the third electrode 18 .
  • the connecting portion for connection from the third terminal 24 b to the third electrode 18 does not affect pen pressure detection, and a light load can be detected with high accuracy.
  • FIG. 7 is a structural diagram (central sectional view) of an example of a position indicating module according to a third embodiment.
  • the same configurations as those of the position indicating module according to the first embodiment shown in FIG. 1 are identified by the same reference symbols.
  • Reference numeral 11 denotes a dielectric substantially in the shape of a disk.
  • Reference numeral 12 denotes a first electrode disposed on a first surface of the dielectric 11 .
  • Reference numeral 14 denotes a spacer.
  • Reference numeral 15 denotes a first terminal, which may comprise a metal. The first terminal 15 is electrically connected to the first electrode 12 on the dielectric 11 .
  • Reference numeral 16 denotes a second terminal, which may comprise a metal.
  • Reference numeral 17 denotes a pen core substantially in the shape of a rod.
  • a third electrode 18 is embedded in a tip 17 a of the pen core 17 .
  • a connecting end 17 b of the pen core 17 is coated with a conductive substance.
  • the connecting end 17 b is electrically connected to the third electrode 18 via a conductor 17 c provided within the pen core 17 .
  • Reference numeral 26 denotes a flexible substrate, as illustrated a polyimide film.
  • FIG. 8 is a developed view of the polyimide film.
  • the polyimide film 26 has a shape formed by coupling a substantially circular-shaped part and a linear part to each other. A conductive pattern is formed on both surfaces of the polyimide film 26 .
  • the polyimide film 26 is bent at a right angle along a-a′ in FIG. 8 .
  • a first surface of the substantially circular-shaped part of the polyimide film 26 which first surface is on the side of the dielectric 11 is provided with a second electrode 26 a (indicated by broken lines in FIG. 8 ) formed by positioning a conductive substance on the first surface of the substantially circular-shaped part of the polyimide film.
  • the second electrode 26 a is electrically connected to the second terminal 16 at a projecting portion 26 b on the substantially circular-shaped part.
  • a circular conductive pattern 26 c is provided at the center of the substantially circular-shaped part.
  • a third terminal 26 d is provided on an end of the linear part of the second surface of the polyimide film 26 .
  • the circular conductive pattern 26 c and the third terminal 26 d are connected to each other by a thin conductive pattern 26 e . These patterns are formed by etching or the like.
  • Reference numeral 27 denotes a pressing body formed of a conductive elastic material, for example a conductive rubber.
  • One end of the pressing body 27 has a rounded cylindrical shape.
  • Another end of the pressing body 27 is provided with a hole into which the connecting end 17 b of the pen core 17 is press-fitted.
  • the shape of a housing 28 to be described later is determined such that the rounded end of the pressing body 27 is in contact with the conductive pattern 26 c on the polyimide film 26 .
  • Reference numeral 28 denotes a housing, in which all members are assembled to form a position indicating module as in the first embodiment.
  • the housing 28 is disassembled into a plurality of parts not shown in the figures, and is assembled by a method such as press-fitting, bonding, or the like.
  • the polyimide film 26 has flexibility, and is therefore in a flat shape in a state in which no pen pressure is applied to the pen core 17 .
  • the dielectric 11 and the second electrode 26 a are in a state of being not in contact with each other due to the spacer 14 .
  • the pressing body 27 displaces the second electrode 26 a , so that the second electrode 26 a comes into contact with the dielectric 11 .
  • the area of the contact between the dielectric 11 and the second electrode 26 a changes according to the magnitude of the pen pressure applied to the pen core 17 .
  • a capacitance between the first terminal 15 and the second terminal 16 changes according to the magnitude of the pen pressure applied to the pen core 17 .
  • the third electrode 18 provided in the pen core 17 is electrically connected to the third terminal 26 d via the pressing body 27 and the conductive pattern 26 c on the second surface side of the polyimide film 26 .
  • the flexibility of the polyimide film 26 and the elasticity of the pressing body 27 maintain the state in which the pressing body 27 and the conductive pattern 26 c on the polyimide film 26 are in contact with each other irrespective of the presence or absence of a pen pressure.
  • connection between the second terminal 16 and the second electrode 26 a is made by the projecting portion 26 b on the polyimide film 26 .
  • the connection may be made via the first surface of the linear part of the polyimide film 26 , and the second terminal may be provided on the back side of the third terminal 26 d.
  • FIG. 9 is a structural diagram (central sectional view) of an example of a position indicating module according to a fourth embodiment.
  • the same configurations as those of the position indicating module according to the first embodiment shown in FIG. 1 are identified by the same reference symbols.
  • Reference numeral 11 denotes a dielectric substantially in the shape of a disk.
  • Reference numeral 12 denotes a first electrode disposed on a first surface of the dielectric 11 .
  • Reference numeral 15 denotes a first terminal, which may comprise a metal. The first terminal 15 is electrically connected to the first electrode 12 on the dielectric 11 .
  • Reference numeral 17 denotes a pen core substantially in the shape of a rod.
  • a third electrode 18 is embedded in a tip 17 a of the pen core 17 .
  • a connecting end 17 b of the pen core 17 is coated with a conductive substance.
  • the connecting end 17 b is electrically connected to the third electrode 18 via a conductor 17 c provided within the pen core 17 .
  • Reference numeral 29 denotes a flexible substrate, which as illustrated is a polyimide film.
  • FIG. 10 is a developed view of the polyimide film.
  • the polyimide film 29 has a shape formed by coupling a circular-shaped part to two linear parts. Conductive patterns are formed on both surfaces of the polyimide film 29 .
  • the polyimide film 29 is bent at a right angle along each of a-a′ and b-b′ in FIG. 10 . Description will be made supposing that when the polyimide film 29 is fitted as in FIG. 9 , a surface of the circular-shaped part which surface faces the pen core 17 is a front surface, and a surface of the circular-shaped part which surface faces the dielectric 11 is a back surface.
  • FIG. 10 shows, in black, the conductive pattern on the polyimide film 29 as viewed from the front surface, and shows, by dotted lines, the conductive pattern on the back surface of the polyimide film 29 .
  • a pattern 29 a such that three sectors are coupled to each other by a central portion is formed on the front surface of the circular-shaped part as in FIG. 10 .
  • a pattern 29 b is formed in a position in which the pattern 29 a on the front surface is rotated by 60°. Because the sectorial parts of the pattern 29 a thus do not overlap the sectorial parts of the pattern 29 b , signals applied to the respective patterns 29 a and 29 b are prevented from affecting each other.
  • An end (front surface) of the first linear part of the polyimide film 29 is provided with a third terminal 29 d .
  • the third terminal 29 d is connected to the pattern 29 a via a thin pattern 29 c formed on the first linear part of the polyimide film 29 .
  • a second terminal 29 f is provided on an end (back surface) of the second linear part of the polyimide film 29 .
  • the second terminal 29 f is connected to the pattern 29 b via a thin pattern 29 e formed on the second linear part of the polyimide film 29 .
  • Reference numeral 30 denotes a second electrode formed of a conductive elastic material, for example a conductive rubber.
  • the second electrode 30 has substantially a disk shape substantially equal in diameter to the pattern 29 b on the polyimide film 29 .
  • One surface of the second electrode 30 is flat, and another surface of the second electrode 30 is convex.
  • the second electrode 30 is bonded to the back surface of the polyimide film 29 by a conductive adhesive, and is thus electrically connected to the pattern 29 b.
  • Reference numeral 31 denotes a core body holder formed of a conductive material and formed in a substantially cylindrical shape. One end of the core body holder 31 is flat, and another end of the core body holder 31 is provided with a hole in which the connecting end 17 b of the pen core 17 is press-fitted. The flat surface of the core body holder 31 is bonded to the front surface of the polyimide film 29 by a conductive adhesive, and is thus electrically connected to the pattern 29 a.
  • Reference numeral 32 denotes a housing, in which all members are assembled to form a position indicating module as in the first embodiment.
  • the housing 32 is disassembled into a plurality of parts not shown in the figures, and is assembled by a method such as press-fitting, bonding, or the like.
  • the periphery of the circular portion of the polyimide film 29 is fixed by the housing 28 from both of the front surface and the back surface.
  • the back surface side of the polyimide film 29 is held down by a part 32 a that comes into circular line contact with the vicinity of the periphery. This is intended to facilitate displacement of the polyimide film 29 when a pen pressure is applied to the pen core 17 .
  • Dimensions of the housing 32 are determined such that a small clearance is left between the second electrode 30 and the dielectric 11 when no pen pressure is applied to the pen core 17 .
  • the area of contact between the second electrode 30 and the dielectric 11 changes according to the pen pressure applied to the pen core 17 .
  • the third electrode 18 is connected to the third terminal 29 b via the core body holder 31 and the pattern 29 a on the polyimide film 29 irrespective of the presence or absence of a pen pressure.
  • FIG. 11 is a structural diagram (central sectional view) of an example of a position indicating module according to a fifth embodiment.
  • the same configurations as those of the position indicating module according to the first embodiment shown in FIG. 1 are identified by the same reference symbols.
  • Reference numeral 11 denotes a dielectric substantially in the shape of a disk.
  • Reference numeral 12 denotes a first electrode disposed on a first surface of the dielectric 11 .
  • Reference numeral 15 denotes a first terminal, which may comprise a metal. The first terminal 15 is electrically connected to the first electrode 12 on the dielectric 11 .
  • Reference numeral 18 denotes a third electrode.
  • reference numeral 33 denotes a pen core substantially in the shape of a rod.
  • the pen core 33 is substantially the same as the pen core 17 of the position indicating module according to the first embodiment.
  • the pen core 33 constitutes a core body portion.
  • the third electrode 18 is embedded in a tip 33 a of the pen core 33 .
  • An end surface of a connecting end 33 b of the pen core 33 which connecting end is on an opposite side from the tip 33 a is coated with a conductive substance.
  • the connecting end 33 b is electrically connected to the third electrode 18 via a conductor 33 c provided within the pen core 33 .
  • Reference numeral 34 denotes a core body holder molded of a plastic.
  • FIG. 12 is a diagram showing the shape of the core body holder 34 .
  • Two circular press-fitting portions 34 a and 34 b are formed in the core body holder 34 .
  • the connecting end 33 b of the pen core 33 is press-fitted into the press-fitting portion 34 a .
  • a second electrode 35 to be described later is press-fitted into the press-fitting portion 34 b .
  • a slit 34 c is provided to the outer circumference of the press-fitting portion 34 a .
  • a projecting portion 34 d is provided in the outer circumferential direction of the slit 34 c .
  • a bottom portion of the press-fitting portion 34 a , a bottom portion of the slit 34 c , and the projecting portion 34 d form an identical plane for disposing a polyimide film 36 to be described later.
  • a slit 34 e is also provided to the outer circumference of the press-fitting portion 34 b.
  • Reference numeral 36 denotes a flexible substrate, as illustrated a polyimide film.
  • FIG. 13 is a developed view of the polyimide film.
  • a conductive pattern represented by a black part in FIG. 13 is formed on one surface of the polyimide film 36 by etching or the like.
  • a connecting portion 36 a is formed as a conductive pattern on a circular-shaped part on one end side of the polyimide film 36 .
  • a third terminal 36 b is formed as a conductive pattern on a rectangular part on another end side.
  • the connecting portion 36 a and the third terminal 36 b are electrically connected to each other by a linear pattern 36 c on a thin and flexible part of the polyimide film 36 .
  • a part of the thin and flexible part of the polyimide film 36 on which thin and flexible part the linear pattern 36 c is formed is a slightly wider part 36 d , as shown in FIG. 13 .
  • the circular-shaped part of the connecting portion 36 a of the polyimide film 36 is bonded to the bottom portion of the press-fitting portion 34 a of the core body holder 34 .
  • the thin and flexible part on which the linear pattern 36 c is formed is fitted so as to extend to the projecting portion 34 d through the slit 34 c of the core body holder 34 .
  • the connecting end 33 b of the pen core 33 is press-fitted into the press-fitting portion 34 a of the core body holder 34 , whereby the third electrode 18 and the third terminal 36 b are electrically connected to each other.
  • the polyimide film 36 is bonded and fixed to the periphery of a housing 38 to be described later by the wide part 36 d shown in FIG. 13 .
  • a conductive material having elasticity may be interposed between the connecting end 33 b of the pen core 33 and the connecting portion 36 a on the polyimide film 36 in order to ensure connection between the connecting end 33 b of the pen core 33 and the connecting portion 36 a on the polyimide film 36 .
  • Reference numeral 37 denotes a coil spring formed of a conductive material. An external appearance of the coil spring 37 is shown in FIG. 14 .
  • the coil spring 37 includes an elastic winding portion 37 a and a second terminal 37 b extending straight, and includes a connecting portion 37 c extending to the inside of the winding portion 37 a .
  • the coil spring 37 is fitted to the core body holder 34 such that the connecting portion 37 c passes through the slit 34 e.
  • Reference numeral 35 denotes a second electrode formed of a conductive elastic material, for example a conductive rubber, and formed in a cylindrical shape. One end of the second electrode 35 has a rounded dome shape. Another end of the second electrode 35 is press-fitted into the press-fitting portion 34 b of the core body holder 34 . Press-fitting the second electrode 35 into the press-fitting portion 34 b of the core body holder 34 connects the second electrode 35 to the connecting portion 37 c of the coil spring 37 . The second electrode 35 is thus electrically connected to the second terminal 37 b.
  • Reference numeral 38 denotes a housing, in which all members are assembled to form a position indicating module as in the foregoing embodiments.
  • the housing 38 is disassembled into a plurality of parts not shown in the figures, and is assembled by a method such as press-fitting, bonding, or the like.
  • dimensions of the housing 38 are determined such that a small clearance is left between the dome shape portion of the second electrode 35 and the dielectric 11 when no pen pressure is applied to the pen core 33 .
  • the dielectric 11 and the second electrode 35 are not in contact with each other.
  • the second electrode 35 comes into contact with the dielectric 11 . Because the second electrode 35 has elasticity, the area of the contact changes according to the magnitude of the pen pressure applied to the pen core 33 .
  • the flexible part on which the linear conductor pattern 36 c extending from the connecting portion 36 a on the polyimide film 36 is formed is in a direction at a right angle to the direction of displacement of the pen core 33 .
  • the elastic force of the polyimide film 36 against the displacement direction is small compared to the elastic force of the coil spring 37 .
  • the polyimide film 36 therefore hardly hinders the displacement of the pen core 33 .
  • FIG. 15 is a structural diagram (central sectional view) of a modification of the position indicating module according to the fifth embodiment.
  • the same configurations as those of the position indicating module according to the fifth embodiment shown in FIG. 11 are identified by the same reference symbols.
  • This first modification of the fifth embodiment is an example that remedies a problem that the thin and flexible part of the polyimide film 36 may come away from the housing 38 and become loose, as shown in FIG. 11 , because of the presence of the projecting portion 34 d of the press-fitting portion 34 a in the above-described fifth embodiment.
  • a core body holder 34 ′ is used in the first modification of the fifth embodiment.
  • FIG. 16 is a diagram showing the shape of the core body holder 34 ′.
  • a slit 34 c ′ does not have the projecting portion 34 d of the core body holder 34 in the fifth embodiment shown in FIG. 12 .
  • a bottom portion of the slit 34 c ′ is formed so as to be deeper than a bottom portion of a press-fitting portion 34 a , so that a bent portion of a thin and flexible part of a polyimide film 36 is housed within the slit 34 c ′.
  • the thin and flexible part of the polyimide film 36 is in close contact with the side surface of a housing 38 .
  • an uneven portion 34 f is formed on the press-fitting portion 34 a of the core body holder 34 ′.
  • An uneven portion 33 d having a corresponding shape is formed in a part corresponding to the uneven portion 34 f of the press-fitting portion 34 a on a connecting end 33 b side of a pen core 33 .
  • the fitting of the uneven portion 34 f and the uneven portion 33 d to each other locks the pen core 33 , and thus prevents the pen core 33 from being easily detached from the core body holder 34 ′.
  • the uneven portion 33 d is released from the uneven portion 34 f by extracting the pen core 33 with force.
  • one electrode 18 is embedded as the third electrode in the tip 33 a of the pen core 33 .
  • the applicant has proposed detecting an inclination of an axial direction of a stylus pen and an angle of rotation with a direction perpendicular to a tablet surface as an axis in a position detecting device by providing a plurality of electrodes in a pen core. Details of a configuration and operation for detecting an inclination of an axial direction of a stylus pen and an angle of rotation with a direction perpendicular to a tablet surface as an axis are described in detail in a previous application (Japanese Patent Application No. 2012-176102), and therefore description thereof will be omitted in the following.
  • This second modification of the fifth embodiment represents a case where a pen core provided with a plurality of electrodes is used as a pen core as in the previous application.
  • FIG. 17 is a diagram of assistance in explaining a configuration of a pen core 330 in the second modification of the fifth embodiment.
  • FIG. 17(A) is a perspective view of the pen core 330 .
  • FIG. 17(B) is a sectional view of the pen core 330 sectioned along A-A in FIG. 17(A) .
  • FIG. 17(C) is a diagram showing the shape of an end surface of a connecting end 330 b of the pen core 330 which connecting end is on an opposite side from a tip 330 a of the pen core 330 .
  • the pen core 330 in the present example has substantially a rod shape, and includes three electrodes 331 , 332 , and 333 .
  • the three electrodes 331 , 332 , and 333 are formed in a state of being not electrically connected to each other in an axial direction extending from the tip 330 a to the connecting end 330 b .
  • Parts of the three electrodes 331 , 332 , and 333 which parts are exposed at the connecting end 330 b of the pen core 330 are formed so as to swell out to the outside as shown in FIG. 17(C) in order to be able to facilitate connection of the parts to a flexible substrate, as illustrated a polyimide film 360 to be described later.
  • the polyimide film 360 according to the second modification of the fifth embodiment is formed as shown in FIG. 18(A) .
  • a circular-shaped part on one end side of the polyimide film 360 is a connecting portion 360 a for connection to the three electrodes 331 , 332 , and 333 of the pen core 330
  • a rectangular part on another end side of the polyimide film 360 is a third terminal portion 360 b .
  • Three conductive patterns 361 , 362 , and 363 to be connected to the respective three electrodes 331 , 332 , and 333 provided in the pen core 330 are formed on the connecting portion 360 a on the one end side of the polyimide film 360 .
  • three terminals 364 , 365 , and 366 are formed on the third terminal portion 360 b on the other end side of the polyimide film 360 .
  • the three conductive patterns 361 , 362 , and 363 on the connecting portion 360 a are electrically connected to the three terminals 364 , 365 , and 366 on the third terminal portion 360 b by linear patterns 367 , 368 , and 369 on a thin and flexible part of the polyimide film 360 .
  • the circular-shaped part of the connecting portion 360 a of the polyimide film 360 is bonded to a bottom portion of a press-fitting portion 34 a of a core body holder 34 ′, and the thin and flexible part is fitted so as to extend to the outside of a housing 38 through a slit 34 c ′ of the core body holder 34 ′.
  • the connecting end 330 b of the pen core 330 is press-fitted into the press-fitting portion 34 a of the core body holder 34 ′, whereby the electrodes 331 , 332 , and 333 as the third electrode are electrically connected to the three terminals 364 , 365 , and 366 on the third terminal portion 360 b .
  • the polyimide film 360 is bonded and fixed to the periphery of the housing 38 to be described later by a wide part shown in FIG. 18(A) .
  • an uneven portion 330 c to be fitted to an uneven portion 34 f at a time of insertion into the press-fitting portion 34 b of the core body holder 34 ′ is formed, and a projecting portion 330 d for positioning the pen core 330 in a circumferential direction is formed.
  • a groove to be fitted to the projecting portion 330 d is formed at a determined position in the circumferential direction of the press-fitting portion 34 a of the core body holder 34 ′.
  • the fitting of the projecting portion 330 d into the groove uniquely determines the circumferential position of the pen core 330 .
  • the electrodes 331 , 332 , and 333 as the third electrode are thereby electrically connected to the three conductive patterns 361 , 362 , and 363 on the connecting portion 360 a of the polyimide film 360 in determined relation.
  • FIG. 18(B) is a diagram showing another example of a polyimide film used in the second modification of the fifth embodiment.
  • a connecting portion 360 c which is formed by a circular part, and on which three electrodes 361 A, 362 A, and 363 A as a third electrode are formed, is provided in substantially a central portion in a longitudinal direction of a polyimide film 360 A in the present example.
  • Third terminal portions are separated into two parts, which are provided on both sides of the connecting portion 360 c.
  • a third terminal part 360 d on which a terminal 364 A of three terminals of third terminal portions is formed is provided on the left side of the connecting portion 360 c
  • a third terminal part 360 e on which a terminal 365 A and a terminal 366 A of the three terminals of the third terminal portions are formed is provided on the right side of the connecting portion 360 c .
  • the conductive pattern 361 A on the connecting portion 360 c is electrically connected to the terminal 364 A via a linear pattern 367 A.
  • the conductive patterns 362 A and 363 A on the connecting portion 360 c are electrically connected to the terminals 365 A and 366 A via linear patterns 368 A and 369 A.
  • the third terminal portions are divided into the two third terminal parts 360 d and 360 e , as described above. Therefore, though not shown in the figures, the core body holder 34 ′ is provided with a groove portion leading out the third terminal part 360 d to the outside and a groove portion leading out the third terminal part 360 e.
  • FIG. 19 is a sectional view of a part of a position indicator (electronic pen) including a position indicating module according to a sixth embodiment.
  • the same configurations as those of the position indicating module according to the foregoing fifth embodiment are identified by the same reference symbols.
  • Pen pressure detecting means is configured as a variable capacitance capacitor as in the fifth embodiment.
  • Reference numeral 11 denotes a dielectric substantially in the shape of a disk.
  • Reference numeral 35 denotes a second electrode formed of a conductive elastic material.
  • Reference numeral 37 denotes a coil spring formed of a conductive material. The coil spring 37 has a second terminal 37 b , and has a connecting portion 37 c connected to the second electrode 35 .
  • Reference numeral 39 denotes a first electrode comprising a conductive metal.
  • the first electrode 39 is provided so as to be in pressure contact with a first surface of the dielectric 11 .
  • a first terminal 39 a integral with the first electrode 39 is led out from the first electrode 39 .
  • the second electrode is attached to a core body holder 340 as in the foregoing fifth embodiment.
  • the second electrode 35 fixed to the core body holder 340 is configured to be movable in an axial direction within a housing 38 ′ according to a pen pressure applied to a pen core 110 to be described later.
  • reference numeral 101 denotes a case which may be formed of a cylindrical conductive material.
  • Reference numeral 102 denotes a front cap, which may be made of a conductor material formed in a tapered shape.
  • Reference numeral 103 denotes a pen tip guarding member, which may be formed of an insulative material.
  • a board holder 104 is housed within a hollow portion of the case 101 .
  • a printed board 105 is attached to a printed board mounting base portion 104 a of the board holder 104 .
  • a position indicating module is retained by a module retaining portion 104 b of the board holder 104 .
  • a battery not shown in the figure is housed in the case 101 .
  • Reference numeral 110 denotes a pen core, which may be formed of a conductive rod-shaped body such as a metal in the present example.
  • the pen core 110 may also be formed of a conductive felt.
  • the pen core 110 constitutes a third electrode.
  • Reference numeral 111 denotes a core holder, which has a retaining portion 111 a retaining the pen core 110 .
  • a conductive elastic member 112 which may be formed of a conductive material having elasticity such for example as a conductive rubber is housed within the retaining portion 111 a .
  • the pen core 110 is fitted into the retaining portion 111 a via the conductive elastic member 112 .
  • the pen core 110 can be extracted from the core holder 111 by being pulled out with force.
  • a core body portion is formed with the pen core 110 fitted in the core holder 111 .
  • the core holder 111 has a rod-shaped portion 111 b fitted into the core body holder 340 on an opposite side of the core holder 111 from the retaining portion 111 a retaining the pen core 110 .
  • the rod-shaped portion 111 b constitutes a transmitting member that transmits an external force (pen pressure) applied to the pen core 110 to the second electrode 35 retained by the core body holder 340 .
  • a fitting portion 340 a into which the rod-shaped portion 111 b is fitted is formed in the core body holder 340 .
  • the rod-shaped portion 111 b of the core holder 111 is press-fitted into the fitting portion 340 a .
  • a swelling portion is formed in the vicinity of an end portion of the rod-shaped portion 111 b . The swelling portion is engaged with the core body holder 340 . The core holder 111 is thereby prevented from falling off the core body holder 340 .
  • a coil spring 113 which may be formed of a conductive material such as a conductive metal is fitted to the rod-shaped portion 111 b of the core holder 111 .
  • the coil spring 113 biases the core holder 111 toward the pen core 110 with respect to the board holder 104 .
  • the housing 38 ′ is provided with a conductor terminal member 115 disposed so as to straddle the housing 38 ′ and extend to the printed board 105 side.
  • the conductor terminal member 115 and the coil spring 113 formed of a conductive material constitute an electric connecting member.
  • An electric connection to a circuit member for supplying a signal on the printed board 105 is realized by the electric connecting member.
  • the conductor terminal member 115 includes: an abutting plate portion 115 a that one end of the coil spring 113 abuts against; and a third terminal 115 b , which is formed by an extending portion connecting the abutting plate portion 115 a to a copper foil part connected to a signal supply terminal of the printed board 105 such that the extending portion straddles the part of the pressure sensing part retaining portion 104 b of the board holder 104 .
  • a signal from the signal supply terminal of the printed board 105 is supplied to the pen core 110 via the conductor terminal member 115 , the coil spring 113 , the core holder 111 , and the conductive elastic member 112 .
  • a variable capacitance capacitor is formed by the dielectric 11 , the first electrode 12 , the second electrode 13 or 26 a , and the spacer 14 each as an individual constituent part forming a pen pressure detecting unit.
  • a variable capacitance capacitor is formed by the dielectric 11 , the first electrode 12 or 39 , and the second electrode 30 or 35 each as an individual constituent part forming a pen pressure detecting unit.
  • a capacitance type pressure sensing device as one semiconductor device is used as a variable capacitance capacitor forming a pen pressure detecting unit.
  • FIG. 20 shows an outline of a position indicating module according to the seventh embodiment.
  • FIG. 21 is an exploded view of an internal configuration of the position indicating module according to the seventh embodiment, the position indicating module including a pressure sensing unit 61 , a pen core 62 , a core body holder 63 , a polyimide film 64 , and a pressing portion 65 . All of these parts 61 to 65 are united within a housing 66 , and formed as the position indicating module.
  • the pressure sensing unit 61 is formed by a MEMS (Micro Electro Mechanical System) sensor, which is an example of a capacitance type pressure sensing device as shown in FIG. 2 of Japanese Patent Laid-Open No. 2013-156066, for example.
  • MEMS Micro Electro Mechanical System
  • This MEMS sensor is a semiconductor device that detects an applied pressure as a change in capacitance.
  • the MEMS sensor has a configuration in which a first electrode configured to bend when receiving an external pressure and a fixed second electrode are arranged so as to be opposed to each other with an air layer (space) as a dielectric interposed between the first electrode and the second electrode.
  • the MEMS sensor receives an external pressure, the surface of the first electrode bends.
  • a distance between the first electrode and the second electrode with the air layer interposed therebetween changes, and therefore a capacitance between the first electrode and the second electrode changes.
  • the MEMS sensor is configured to detect the externally applied pressure as a change in this capacitance.
  • the pressure sensing unit 61 may be formed by such a unit as is obtained by modularizing a part (the dielectric 11 , the first electrode 12 , the second electrode 13 , and the spacer 14 ) of the configuration of the position indicating module illustrated in the first embodiment, for example.
  • the pen core 62 in the present example may be formed of a nonconductor material, for example a resin, substantially in the shape of a rod.
  • the pen core 62 constitutes a core body portion.
  • the pen core 62 has a third electrode in a tip not shown in the figure, and has a conductive connecting end 62 b on an opposite side from the tip.
  • the pen core 62 in the present example has a slightly uneven portion 62 c on the conductive connecting end 62 b side.
  • the core body holder 63 has a hole having a shape into which the uneven portion 62 c of the pen core 62 is sized and shaped to fit, and has a structure from which the pen core 62 is detachable.
  • FIG. 22 is a developed view of the polyimide film 64 .
  • a conductive pattern shown in black in FIG. 22 is formed on one surface of the polyimide film 64 by etching or the like.
  • a conductive pattern 64 a to be connected to the conductive connecting end 62 b of the pen core 62 is formed on a circular-shaped part on one end side of the polyimide film 64
  • a connecting terminal 64 b is formed as a conductive pattern on a rectangular part on another end side of the polyimide film 64 .
  • the conductive pattern 64 a side of the polyimide film 64 is bonded to the core body holder 63 .
  • the conductive connecting end 62 b of the pen core 62 is electrically connected to the conductive pattern 64 a on the polyimide film 64 .
  • the electric connection to the conductive pattern 64 a on the polyimide film 64 may be ensured by attaching an elastic conductive material such as a conductive rubber to a contact portion of the conductive connecting end 62 b of the pen core 62 .
  • the pressing portion 65 is bonded to a side of the polyimide film 64 bonded to the core body holder 63 on which side the conductor pattern 64 a is not formed.
  • the pressing portion 65 in the present example is formed of a material having an elastic force such as a silicon rubber in a substantially conical shape. A tip of the substantially conical shape of the pressing portion 65 depresses a pressing force application surface 61 a of the MEMS sensor 61 .
  • FIG. 23 is a diagram showing an example of a configuration in a case where the position indicating module according to the seventh embodiment is attached to a printed board 67 .
  • a groove 66 a communicating with the inside of the housing 66 is formed in a part of a peripheral side surface of an end portion of the tubular-shaped housing 66 which end portion is on the printed board 67 side.
  • the polyimide film 64 is housed within the groove 66 a , and the connecting terminal 64 b of the polyimide film 64 is led out from the groove 66 a.
  • a recessed portion 66 b into which an end portion of the printed board 67 is inserted and a pair of projections 66 c (only one of the pair of projections is shown in FIG. 23 ) that sandwich the printed board 67 therebetween in a thickness direction.
  • the printed board 67 is coupled to the housing 66 , and is for example bonded to the housing 66 .
  • the connecting terminal 64 b of the polyimide film 64 which connecting terminal is led out from the housing 66 is for example soldered to the printed board 67 , and is thus connected to an electronic circuit provided on the printed board 67 .
  • the pen pressure when a pen pressure is applied to the pen core 62 , the pen pressure is transmitted to the pressing portion 65 via the core body holder 63 to press the pressing force application surface 61 a of the MEMS sensor 61 , and thus the capacitance of the MEMS sensor 61 exhibits a change according to the pen pressure. Hence, the pen pressure can be detected from the change in the capacitance of the MEMS sensor 61 .
  • FIG. 24 shows an example of an internal structure of an embodiment of a stylus pen.
  • reference numeral 40 denotes the position indicating module according to the first embodiment shown in FIG. 1 .
  • the same configurations as those of the first position indicating module shown in FIG. 1 are identified by the same reference symbols.
  • reference numeral 15 denotes a first terminal
  • reference numeral 16 denotes a second terminal
  • reference numeral 17 denotes a pen core
  • reference numeral 18 denotes a third electrode
  • reference symbol 19 b denotes a third terminal.
  • Reference numeral 41 denotes an electric double layer capacitor that stores power.
  • Reference numeral 42 denotes a coil for charging the electric double layer capacitor 41 in a noncontact manner.
  • the coil 42 is wound around a hollow cylindrical ferrite core, which is disposed such that the pen core 17 passes through the ferrite core.
  • Reference numeral 43 denotes a printed board.
  • FIG. 25 shows a circuit configuration of the stylus pen shown in FIG. 24 .
  • the same parts as in FIG. 24 are identified by the same reference symbols.
  • reference numeral 18 denotes a third electrode
  • reference numeral 41 denotes an electric double layer capacitor
  • reference numeral 42 denotes a coil for charging the electric double layer capacitor 41 in a noncontact manner.
  • Reference numeral 44 denotes a microprocessor.
  • Reference numeral 45 denotes an oscillating circuit that generates a signal of a fixed frequency.
  • Reference numeral 46 denotes a modulating circuit, which subjects the signal output from the oscillating circuit 45 to ASK (Amplitude Shift Keying) modulation on the basis of a control signal p from an output terminal P 1 of the microprocessor 44 .
  • a signal r modulated by the modulating circuit 46 is supplied to the third electrode 18 , and is sent out as a signal. In this case, the signal supply from the modulating circuit 46 to the third electrode 18 is performed via the position indicating module 40 .
  • Reference numeral 47 denotes a charging circuit for charging the electric double layer capacitor 41 by a voltage induced in the coil 42 . While the coil 42 is disposed around the pen core 17 in the present embodiment, the coil 42 may be disposed at a position different from that of the pen core 17 .
  • Reference numeral 48 denotes a voltage converting circuit, which generates a fixed voltage from a voltage stored in the electric double layer capacitor 41 , and supplies the voltage as power for driving each circuit, that is, the microprocessor 44 , the oscillating circuit 45 , and the modulating circuit 46 . Description will be made supposing that the fixed power supply voltage is 1.5 V in the present embodiment.
  • Reference numeral 40 a denotes a variable capacitance capacitor formed by the dielectric 11 , the first terminal 15 , and the second terminal 16 of the position indicating module 40 .
  • a resistance R is connected in parallel with the variable capacitance capacitor 40 a .
  • One terminal of the variable capacitance capacitor 40 a is connected to an input-output terminal P 2 of the microprocessor 44 . When the terminal P 2 is in an output state, the terminal P 2 outputs a high level, so that the variable capacitance capacitor 40 a is charged to 1.5 V. When the terminal P 2 is in an input state, the terminal P 2 is in a high-impedance state.
  • the terminal P 2 When the terminal P 2 is in the input state, the terminal P 2 operates as a comparator having a fixed threshold value Vth. Description will be made supposing that the threshold value in the present embodiment is half the power supply voltage, that is, 0.75 V.
  • the frequency of the signal generated by the oscillating circuit 45 is set at about 1.5 MHz to 2.0 MHz.
  • the signal can be detected by a tablet without a need for such a configuration that a casing not shown in FIG. 24 is electrically grounded and touched by a hand.
  • FIG. 26 shows the operation of the present embodiment, and shows changes in the signals p, q, and r in FIG. 25 .
  • the microprocessor 44 performs control such that the terminal P 1 (signal p) maintains a high level for a certain period.
  • the signal (r) is thereby emitted from the third electrode 18 continuously during the certain period (see a continuous transmission period in FIG. 26 ).
  • the microprocessor 44 controls the terminal P 2 to determine a pen pressure applied to the position indicating module 40 .
  • the microprocessor 44 charges the variable capacitance capacitor 40 a by setting the terminal P 2 in an output state. Next, the microprocessor 44 switches the terminal P 2 to an input state. At this time, a charge stored in the variable capacitance capacitor 40 a is discharged by the resistance R connected in parallel with the variable capacitance capacitor 40 a , and therefore the voltage (q) of the variable capacitance capacitor 40 a is gradually lowered. A time Tp taken for the voltage q to be lowered to 0.75 V or lower after the terminal P 2 is switched to the input state is obtained. This time Tp corresponds to the pen pressure to be obtained. In the present embodiment, the pen pressure is obtained as a value of 11 bits.
  • the microprocessor 44 After an end of this continuous transmission period, the microprocessor 44 performs ASK modulation by controlling the terminal P 1 to a high level or a low level in determined cycles (Td). At this time, a high level is set in the first cycle (start signal in FIG. 26 ). This is to enable subsequent data sending-out timing to be correctly determined on the tablet side.
  • the microprocessor 44 sequentially transmits pen pressure data of 11 bits following the start signal. Then, the microprocessor 44 controls the terminal P 1 to a low level when transmission data is 0, and controls the terminal P 1 to a high level when transmission data is 1.
  • FIG. 26 shows a case where the pen pressure to be transmitted is “10101110101.” In the present embodiment, the operation of FIG. 26 is performed repeatedly.
  • the position indicating module according to the first embodiment ( FIG. 1 ) is used in the stylus pen according to the present embodiment.
  • the position indicating modules according to the second to seventh embodiments may be used.
  • configurations similar to the position indicating modules according to the first to seventh embodiments may be directly formed within the stylus pen.
  • FIG. 27 represents an example of a configuration of a tablet used to detect the stylus pen.
  • reference numeral 50 denotes the stylus pen shown in FIG. 24 and FIG. 25
  • reference numeral 51 denotes a tablet sensor having transparent glass as a base material.
  • the front surface of the tablet sensor 51 is provided with an X-electrode group arranged in an X-direction
  • the back surface of the tablet sensor 51 is provided with a Y-electrode group arranged in a Y-direction.
  • the X-electrode group and the Y-electrode group are formed as transparent electrodes of ITO (Indium Tin Oxide; transparent conductive film).
  • ITO Indium Tin Oxide
  • the tablet sensor 51 is disposed on a display device not shown in the figures, so that a display position on the display device can be directly input by the stylus pen 50 .
  • Reference numeral 52 denotes a selecting circuit that selects one electrode from among the X-electrode group and the Y-electrode group. In the present embodiment, description will be made supposing that there are 40 X-electrodes (X 1 to X 40 ) and there are 30 Y-electrodes (Y 1 to Y 30 ).
  • the electrode selected by the selecting circuit 52 is connected to an amplifying circuit 53 .
  • a signal from the stylus pen 50 is detected by the selected electrode, and amplified by the amplifying circuit 53 .
  • the output of the amplifying circuit 53 is supplied to a band-pass filter circuit 54 to extract a component of a frequency transmitted from the stylus pen 50 .
  • the output signal of the band-pass filter circuit 54 is detected by a detecting circuit 55 .
  • the output signal of the detecting circuit 55 is supplied to a sample and hold circuit 56 to be sampled and held in determined timing, and is thereafter converted into a digital value by an AD (Analog-to-Digital) converting circuit 57 .
  • This digital data is read and processed by a microprocessor 58 .
  • the microprocessor 58 internally has a ROM (Read-Only Memory) and a RAM (Random Access Memory), and operates according to a program stored in the ROM to send out respective control signals to the sample and hold circuit 56 , the AD converting circuit 57 , and the selecting circuit 52 .
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • FIG. 28 shows an X-axis whole surface scanning operation for obtaining an approximate X-direction position of the stylus pen 50 on the tablet sensor 51 .
  • the microprocessor 58 sends out a control signal to select the electrode X 1 to the selecting circuit 52 , and reads data output from the AD converting circuit 57 at the time of selecting the electrode X 1 as a signal level.
  • the microprocessor 58 similarly reads signal levels while sequentially changing the selection by the selecting circuit 52 to the electrodes X 2 , X 3 , X 4 , . . . .
  • the microprocessor 58 stores the number of the X-electrode from which the highest signal level is detected (electrode X 11 in FIG. 28 ).
  • the microprocessor 58 When determining that the stylus pen 50 is located around the electrode X 11 , the microprocessor 58 performs an operation for transition to partial scanning as shown in FIG. 29 .
  • This operation for transition to partial scanning is an operation for the microprocessor 58 to synchronize timing thereof with the operation of the stylus pen 50 by detecting the time of a start of the period of continuous transmission from the stylus pen 50 , and obtain an approximate position of the stylus pen 50 on the Y-axis, when the stylus pen 50 repeats the operation as shown in FIG. 26 .
  • the microprocessor 58 sends out a control signal to select the electrode X 11 determined in the above-described X-axis whole surface scanning operation to the selecting circuit 52 .
  • a signal corresponding to the signal transmitted from the stylus pen 50 is induced in the electrode X 11 , and a voltage corresponding to the level of the signal is generated in the detecting circuit 55 .
  • the microprocessor 58 reads the signal level by operating the sample and hold circuit 56 and the AD converting circuit 57 in certain cycles.
  • the cycles of operating the sample and hold circuit 56 and the AD converting circuit 57 are each set to be a time sufficiently shorter than a cycle (Td) in which the stylus pen 50 makes transmission in a data transmission period.
  • the microprocessor 58 determines that the continuous transmission period of the stylus pen 50 is started. The microprocessor 58 then makes a transition to a Y-axis whole surface scanning operation ( FIG. 29 ). This time (Ts) is set to be a time sufficiently longer than a cycle (Td) in which the stylus pen 50 makes transmission in a data transmission period.
  • the microprocessor 58 controls the selecting circuit 52 to sequentially select the electrodes Y 1 to Y 30 , and reads the signal levels from the AD converting circuit 57 . At this time, the microprocessor 58 stores an electrode from which a highest signal level is detected. In the present embodiment, description will be made supposing that a highest signal level is detected from the electrode Y 20 .
  • the microprocessor 58 After the selecting circuit 52 selects the last electrode Y 30 , and the detection of the signal level is ended, the microprocessor 58 performs an operation for waiting for an end of the period of continuous transmission from the stylus pen 50 .
  • the microprocessor 58 performs control so that the selecting circuit 52 selects the electrode X 11 .
  • a signal having a level equal to or more than the above-described determined value is detected.
  • a time at which the received signal level ceases to reach the determined value is the end time of the continuous transmission from the stylus pen 50 .
  • the stylus pen 50 next starts a data transmission period. However, a position of the stylus pen 50 is not determined at this time. Thus, in this case, a transition is made to a partial scanning operation shown in FIG. 30 without data being read.
  • the microprocessor 58 determines that the continuous transmission period of the stylus pen 50 is started. The microprocessor 58 then makes a transition to a coordinate detecting operation (step 1 in FIG. 30 ).
  • This time (Ts) is similar to that described with reference to FIG. 29 , and is set to be a time sufficiently longer than a cycle (Td) in which the stylus pen 50 makes transmission in a data transmission period.
  • the selecting circuit 52 sequentially selects five electrodes X 9 to X 13 with the electrode X 11 at a center, and the microprocessor 58 operates the AD converting circuit 57 to read the signal levels (step 1 ).
  • the number of an electrode detecting a highest signal level (electrode X 11 in this case) and the signal level VPX are stored, and the levels detected by the electrodes adjacent to the electrode detecting the highest signal level on both sides are stored as VAX and VBX (step 1 ).
  • the selecting circuit 52 sequentially selects five electrodes Y 18 to Y 22 with the electrode Y 20 at a center, and the microprocessor 58 reads the signal levels (step 1 ).
  • the number of an electrode detecting a highest signal level (electrode Y 20 in this case) and the signal level VPY are stored, and the levels detected by the electrodes adjacent to the electrode detecting the highest signal level on both sides are stored as VAY and VBY (step 1 ).
  • the signal levels VPX, VAX, VBX, VPY, VAY, and VBY obtained here are used for calculation of coordinate values by calculation equations to be described later.
  • the microprocessor 58 next performs an operation for waiting for an end of the period of continuous transmission from the stylus pen 50 .
  • the microprocessor 58 performs control so that the selecting circuit 52 selects the electrode X 11 from which a peak is detected in the above-described coordinate detecting operation.
  • a time at which the received signal level ceases to reach the determined value is the end time of the continuous transmission from the stylus pen 50 (step 1 ).
  • the microprocessor 58 After detecting an end of the continuous transmission from the stylus pen 50 , the microprocessor 58 starts an operation of detecting timing of a start signal transmitted prior to pen pressure data (step 2 ).
  • the microprocessor 58 performs control to repeatedly start the sample and hold circuit 56 and the AD converting circuit 57 in a state in which the electrode X 11 is selected.
  • the microprocessor 58 stores, as t 1 , a time at which the signal level becomes equal to or more than the above-described determined value.
  • the microprocessor 58 starts an operation of receiving data from the stylus pen at a time after a wait for a fixed time Tw from time t 1 (step 2 ). This time Tw is assumed to be taken for the signal level received by the tablet to become substantially zero after an end of transmission of the start signal from the stylus pen 50 , and is set to be a time determined in advance.
  • the microprocessor 58 starts a timer not shown in the figures at the same time that the above-described waiting time reaches Tw. This timer repeatedly counts a value coinciding with the above-described time Td (cycle of data transmission from the stylus pen) from zero (step 2 ). During the operating period of one cycle of the timer, the microprocessor 58 repeatedly starts the sample and hold circuit 56 and the AD converting circuit 57 to read the signal level.
  • the counting of the above-described timer is performed 11 times, and thus data of 11 bits is stored.
  • This data of 11 bits corresponds to the data of 11 bits shown in FIG. 26 , and is a result of detection of a pen pressure applied to the position indicating module 40 of the stylus pen 50 .
  • FIG. 30 represents a case where the pen pressure data is “10101110101.”
  • step 2 the data reception is performed while the electrode (X 11 ) from which the maximum level is detected is selected from among the X-axis electrodes.
  • this reception may be performed while the electrode (Y 20 ) from which the maximum level is detected is selected from among the Y-axis electrodes.
  • step 2 After the reception of the data of 11 bits is ended in step 2 , a transition is made to the operation of detecting a start of a period of continuous transmission from the stylus pen (step 1 ), and the microprocessor 58 repeatedly performs the operation of FIG. 29 .
  • the coordinate position (X, Y) of the stylus pen 50 is obtained by the following equation from the reception levels obtained in the above-described step 1 .
  • X Px +( Dx/ 2) ⁇ (( VBX ⁇ VAX )/(2 ⁇ VPX ⁇ VAX ⁇ VBX )) (equation 1)
  • Px is the coordinate position of the electrode from which the maximum level is detected on the X-axis (electrode X 11 in this case)
  • Dx is an arrangement pitch between the X-axis electrodes.
  • Y Py +( Dy/ 2) ⁇ (( VBY ⁇ VAY )/(2 ⁇ VPY ⁇ VAY ⁇ VBY )) (equation 2)
  • Py is the coordinate position of the electrode from which the maximum level is detected on the Y-axis (electrode Y 20 in this case)
  • Dy is an arrangement pitch between the Y-axis electrodes.
  • the part acting to return the pen core 17 when a pen pressure disappears and the connecting portion for connection to the third electrode 18 are similar structures (a coil spring or a polyimide film).
  • the connecting portion for connection to the third electrode 18 does not affect pen pressure detection. It is therefore possible to realize an electrostatic stylus pen capable of accurately detecting a change in a pen pressure applied by a light touch.
  • connection line (flexible part 36 c of the polyimide film 36 ) for connection to the electrode in the pen core is in a direction at a right angle to the direction of displacement of the pen core 33 .
  • the connection line does not affect pen pressure detection. It is therefore possible to realize an electrostatic stylus pen capable of accurately detecting a change in a pen pressure applied by a light touch.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
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EP3091423A4 (en) 2017-08-16
EP3091423B1 (en) 2018-09-19
US20160313812A1 (en) 2016-10-27
EP3091423A1 (en) 2016-11-09
CN105829997A (zh) 2016-08-03
CN105829997B (zh) 2019-05-17
JPWO2015098486A1 (ja) 2017-03-23
US20190243473A1 (en) 2019-08-08
KR20160102170A (ko) 2016-08-29
KR102293319B1 (ko) 2021-08-25
JP5761773B1 (ja) 2015-08-12
US10379642B1 (en) 2019-08-13

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